use case and class diagrams
If I'm creating a sequence diagram for a use case, should the objects in the sequence be based on the methods and classes in the class diagram, or is that not necessarily required? and is there any sources you found it helpful in creating sequence diagrams?

If I'm creating a sequence diagram for a use case, should the objects in the sequence be based on the methods and classes in the class diagram, or is that not necessarily required? and is there any sources you found it helpful in creating sequence diagrams?